ncoplin_at_orbeng.com
Date: 2002-12-18 09:31:38
Hi All,
I received a GeoRAM expansion the other day which I had bought on eBay to
that I could checkout its memory refresh scheme. It uses 44256 chips, and so
needs a refresh scheme as the VIC accesses won't be enough...
A couple questions:
* before I reverse engineer the refresh logic, has someone else done it?
* memory expansion, apparantly designs were made for this as well as the
1750, etc, but I've never come across them. Has anyone got the upgrade
schematic?
- Nick
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